Adjustable lamp



FIG. 1 is a perspective view of an adjustable lamp showing my new design, with the base being shown in broken lines for illustrative purposes only;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a top plan view thereof. 

The ornamental design for an adjustable lamp, as shown and described. 